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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7c532f274fd2cf356dcb71e57d36b88226d505452df588c37762355098a628' 
  AND token = '2yXT0iEVUEyM8dgJuNJId61Q2ecrRvCIK80xHI6pRRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}